106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/* Portions taken from the skey distribution on Oct 21 1993 */
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#ifdef SKEY
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <termios.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <skey.h>
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/* skey_getpass - read regular or s/key password */
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char *skey_getpass(prompt, pwd, pwok)
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char *prompt;
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struct passwd *pwd;
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int pwok;
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{
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static char buf[128];
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struct skey skey;
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char *cp;
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void rip();
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struct termios saved_ttymode;
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struct termios noecho_ttymode;
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char *username = pwd ? pwd->pw_name : "nope";
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int sflag;
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/* Attempt an s/key challenge. */
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if ((sflag = skeychallenge(&skey, username, buf)) == 0) {
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printf("%s\n", buf);
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}
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if (!pwok) {
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printf("(s/key required)\n");
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}
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fputs(prompt, stdout);
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fflush(stdout);
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/* Save current input modes and turn echo off. */
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tcgetattr(0, &saved_ttymode);
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tcgetattr(0, &noecho_ttymode);
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noecho_ttymode.c_lflag &= ~ECHO;
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tcsetattr(0, TCSANOW, &noecho_ttymode);
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/* Read password. */
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buf[0] = 0;
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fgets(buf, sizeof(buf), stdin);
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rip(buf);
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/* Restore previous input modes. */
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tcsetattr(0, TCSANOW, &saved_ttymode);
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/* Give S/Key users a chance to do it with echo on. */
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if (sflag == 0 && feof(stdin) == 0 && buf[0] == 0) {
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fputs(" (turning echo on)\n", stdout);
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fputs(prompt, stdout);
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fflush(stdout);
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fgets(buf, sizeof(buf), stdin);
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rip(buf);
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} else {
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putchar('\n');
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}
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return (buf);
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}
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/* skey_crypt - return encrypted UNIX passwd if s/key or regular password ok */
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char *skey_crypt(pp, salt, pwd, pwok)
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char *pp;
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char *salt;
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struct passwd *pwd;
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int pwok;
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{
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struct skey skey;
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char *p;
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char *crypt();
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/* Try s/key authentication even when the UNIX password is permitted. */
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if (pwd != 0 && skeylookup(&skey, pwd->pw_name) == 0
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&& skeyverify(&skey, pp) == 0) {
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/* s/key authentication succeeded */
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if (skey.n < 5)
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printf("Warning! Change s/key password soon\n");
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return (pwd->pw_passwd);
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}
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/* When s/key authentication does not work, always invoke crypt(). */
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p = crypt(pp, salt);
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if (pwok && pwd != 0 && strcmp(p, pwd->pw_passwd) == 0)
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return (pwd->pw_passwd);
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/* The user does not exist or entered bad input. */
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return (":");
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}
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#endif SKEY
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